57
Vascular lesions Characteristics of vasculitis Involvement of large, medium, and small vessels Involvement of arteries and veins Inflammation is diffuse, not patchy IC deposition is not seen Neuropathy and glomerulonephritis is rare

75
Gastrointestinal lesions Ulcer Involve all parts of the GI tracts from the esophagus to the anus The most common site is the terminal ileum Numerous, deep, and punched out They cause colitis like symptoms Anal ulcer and fistula is rare

78
Gastrointestinal lesions Ulcer A large, discrete ulcer with thickened mucosal folds at the terminal ileum Diffuse ulcers in the midesophagus along with fold thickening and luminal narrowing of the esophagus

79
Nervous system involvement More common in western countries, rare in Iran Rarely it is the first symptom Symptoms are episodic It is a poor prognostic sign Peripheral neuropathy is rare

82
Nervous system involvement Parenchymal lesions Two intramedullary hyperintense discrete nodular lesion areas at the level of C4 and C6 White matter changes. in the pons Hyperintense lesion in the right thalamus

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